NL189426C - METHOD FOR DETERMINING THE COLOR OF A TABLE CUT GEMSTONE. - Google Patents

METHOD FOR DETERMINING THE COLOR OF A TABLE CUT GEMSTONE.

Info

Publication number: NL189426C
Authority: NL; Netherlands
Prior art keywords: color; determining; cut gemstone; table cut; gemstone
Prior art date: 1978-10-09

Application number

NLAANVRAGE7907348,A

Other languages

Dutch (nl)

Other versions

NL189426B (en

NL7907348A (en

Original Assignee

De Beers Cons Mines Ltd

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1978-10-09

Filing date

1979-10-03

Publication date

1993-04-01

1979-10-03 Application filed by De Beers Cons Mines Ltd filed Critical De Beers Cons Mines Ltd

1980-04-11 Publication of NL7907348A publication Critical patent/NL7907348A/en

1992-11-02 Publication of NL189426B publication Critical patent/NL189426B/en

1993-04-01 Application granted granted Critical

1993-04-01 Publication of NL189426C publication Critical patent/NL189426C/en

Links

Classifications

- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/87—Investigating jewels

Landscapes

Physics & Mathematics (AREA)
Health & Medical Sciences (AREA)
Life Sciences & Earth Sciences (AREA)
Chemical & Material Sciences (AREA)
Analytical Chemistry (AREA)
Biochemistry (AREA)
General Health & Medical Sciences (AREA)
General Physics & Mathematics (AREA)
Immunology (AREA)
Pathology (AREA)
Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Spectrometry And Color Measurement (AREA)

NLAANVRAGE7907348,A 1978-10-09 1979-10-03 METHOD FOR DETERMINING THE COLOR OF A TABLE CUT GEMSTONE. NL189426C (en)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
GB7839847		1978-10-09
GB7839847		1978-10-09

Publications (3)

Publication Number	Publication Date
NL7907348A NL7907348A (en)	1980-04-11
NL189426B NL189426B (en)	1992-11-02
NL189426C true NL189426C (en)	1993-04-01

Family

ID=10500211

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
NLAANVRAGE7907348,A NL189426C (en)	1978-10-09	1979-10-03	METHOD FOR DETERMINING THE COLOR OF A TABLE CUT GEMSTONE.

Country Status (9)

Country	Link
JP (1)	JPS5598341A (en)
AU (1)	AU527834B2 (en)
BE (1)	BE879290A (en)
CH (1)	CH644452A5 (en)
DE (1)	DE2940625A1 (en)
FR (1)	FR2438837A1 (en)
IL (1)	IL58344A (en)
NL (1)	NL189426C (en)
ZA (1)	ZA795228B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
ZA813263B (en) *	1980-06-04	1982-06-30	De Beers Cons Mines Ltd	The assessment of colour in diamonds and other gems
JPS58728A (en) *	1981-06-25	1983-01-05	Shimadzu Corp	Diamond color measuring device
JPS5830644A (en) *	1981-08-14	1983-02-23	Ii R C:Kk	Method for deciding optical axis
JPH0711488B2 (en) *	1992-12-18	1995-02-08	株式会社泰光	A jewel magnifying device with a cut surface
FR2768513B1 (en) *	1997-09-15	1999-12-03	Jean Pierre Delgrande	COMPARATIVE COLORIMETRIC ANALYSIS METHOD AND CORRESPONDING DEVICE
CA3087312C (en) *	2017-12-29	2022-02-15	Goldway Technology Limited	Diamond clarity measurement process and system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US2992588A (en) *	1958-02-03	1961-07-18	Beckman Instruments Inc	Photometer reflectance unit
DE1772105C2 (en) *	1968-03-30	1974-04-04	Eickhorst, Manfred, 2000 Hamburg	Device for determining the photometric transmission of cut diamonds
BE789234A (en) *	1971-09-29	1973-01-15	Colorant Schmuckstein G M B H	METHOD AND DEVICE FOR REGISTRATION OF THE QUALITIES OF JEWELERY STONES
AT344419B (en) *	1973-03-20	1978-07-25	Dihaco Diamanten Handels Co	DEVICE FOR DETERMINING THE EVALUATION DATA OF COLORED GEMS, IN PARTICULAR DIAMONDS
ZA765149B (en) *	1976-08-27	1978-04-26	De Beers Ind Diamond	Measurement of optical properties
JPS5378855A (en) *	1976-12-21	1978-07-12	Nec Corp	Polygonal jewery identifying device

1979
- 1979-09-27 IL IL58344A patent/IL58344A/en unknown
- 1979-10-02 ZA ZA00795228A patent/ZA795228B/en unknown
- 1979-10-03 NL NLAANVRAGE7907348,A patent/NL189426C/en not_active IP Right Cessation
- 1979-10-05 AU AU51505/79A patent/AU527834B2/en not_active Ceased
- 1979-10-06 DE DE19792940625 patent/DE2940625A1/en not_active Withdrawn
- 1979-10-08 FR FR7924974A patent/FR2438837A1/en active Granted
- 1979-10-09 BE BE0/197549A patent/BE879290A/en not_active IP Right Cessation
- 1979-10-09 CH CH907379A patent/CH644452A5/en not_active IP Right Cessation
- 1979-10-09 JP JP12957079A patent/JPS5598341A/en active Pending

Also Published As

Publication number	Publication date
AU5150579A (en)	1980-04-17
CH644452A5 (en)	1984-07-31
FR2438837A1 (en)	1980-05-09
AU527834B2 (en)	1983-03-24
BE879290A (en)	1980-04-09
ZA795228B (en)	1980-09-24
FR2438837B1 (en)	1983-02-25
IL58344A (en)	1983-09-30
NL189426B (en)	1992-11-02
JPS5598341A (en)	1980-07-26
DE2940625A1 (en)	1980-06-04
NL7907348A (en)	1980-04-11

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Legal Events

Date	Code	Title	Description
1985-01-01	A85	Still pending on 85-01-01
1985-11-01	BA	A request for search or an international-type search has been filed
1985-12-02	BB	A search report has been drawn up
1986-01-02	BC	A request for examination has been filed
1998-07-01	V1	Lapsed because of non-payment of the annual fee	Effective date: 19980501